Dust gun



A. MoslNK Nov. 25, 1952 DUST GUN Filed Feb. l5, 1949 Fla.;

Patented Nov. 25,` 1952 v DUST GUN Albert Morsink, Enschede, NetherlandsApplication February 15, 1949, Serial No. 76,599

In the Netherlands February 16, 1948 2 Claims.

The invention relates to a dust-gun for dispensing powders such asinsecticides with a perforated upperwall in which a bag is xed intelescopic moving cylinders. characterized by the fact, that the bag isairtightly xed by its upper edge to the upper edge of the telescopedcylinder, and lling up nearly the Whole contents of the same cylinder,the bag being closed at the other end and being so shorter than thetelescoped cylinder which is formed with an open bottom. Both cylinderst exactly in respect to in each other and the telescoping lower ormovable cylinder is provided in the bottom thereof with a back-valveacting means.

According to another object of the invention the bottom of the movablecylinder (the lower) is loosely supported by an inwardly directed edgeof the cylindrical wall, so that the bottom is lifted when the saidcylinder is moved downwardly with respect to the rigid, telescopedcylinder and so that air may enter the space below the bag.

Further objects, advantages and capabilities of the invention willappear from the following description of two embodiments thereof in con-Vjunction with the accompanying drawing, in

which Fig. 1 is a sectional view through the improved dust gun,

Fig. 2 is a similar view of another form of the bottom of the movable ortelescoping cylinder, and

Fig. 3 is a plan view of this bottom.

In Fig. 1 the rigid cylinder is indicated by 2. I is the outer ormovable cylinder, 3 is the bag, to be lled with powder. The bag 3, whenclosed, is shorter than the inner, telescoped cylinder 2, and iixedairtightly at 4 to the upper inner edge of the cylinder '2. Thiscylinder 2 is open at its lower end and closed at its upper end by aperforated lid 5.

The bottom 6 of the movable or telescoping cylinder lies loosely uponthe inwardly directly edge 1. When the dust-gun is out of use thecylinder 2 is capped by the cylindrical lid 8.

When the bag 3 is filled with powder from the lower end 9, this end isclosed and it will be noted that the end of this bag does not extendbeyond the lower edge of the rigid cylinder 2 and therefor the bottom 6of the other cylinder will never come into contact with the bag.

To dispense the powder the movable cylinder I is quickly pressedinwardly over the rigid cylinder 2, and, because the bag ts nearlyexactly in the cylinder 2, the air in the space between the bottom E ofthe cylinder I and the bottom surface 9 of the bag is compressed andpresses the powder to the outside. The side walls and bottom of the bagare, of course, air impervious to permit such compression. Further, theexact iit of the bag in the cylinder facilitates such compression sincethe cross-sectional area of the bag, substantially throughout itslength, ls substantially equal to the cross-section of the innercylinder 2 thereby substantially or largely conflning the compressed airto the bottom surface 9.

Then the movable cylinder I is moved back and the air is sucked alongthe opening bottom 6 because the air pressure will open the said bottom.

In Figs. 2 and 3 the bottom II) is fixed in the cylinder I, but isprovided with one or more perforations I2. Upon the bottom I0 a thinpaper diaphragm is xed at the edge I4 by adhesive means or other manner.The said diaphragm is also provided with one or more perforations I3,which perforations I3 are so arranged, that they never cover aperforation I2 e. g., that it must be impossible that, when the movablecylinder I is pressed over the inner cylinder, the compressed air willpass from the inner space between the surfaces I0 and 9 (Fig. l) throughthe perforations I3 and I2 to the outside.

The cylinders may assume varied dimensions and forms and are made ofcardboard, wood. tinned sheet iron, plastic or the like and the bag maybe made of paper, rubber or other suitable material.

What I claim is:

1. A dust gun, which comprises: an outer cylindrical member of rigidmaterial open at its top; an inner cylindrical member of rigid materialopen at its bottom, said inner cylindrical member being telescopedwithin said outer cylindrical member, and slidable with respect thereto;a check valve in the bottom end portion of said outer cylindricalmember, said check valve permitting air to enter within said outercylindrical member, but preventing air from escaping therefrom when saidouter cylindrical member is slid with respect to said telescopng innercylindrical member so that its bottom end approaches the open bottomportion of said inner cylindrical member; a perforated lid secured tosaid inner cylindrical member at its upper end portion; and a bag forpowder positioned within said inner cylindrical member and fixed theretoin a substantially air-tight manner with only its upper edge portionsecured to the inside upper edge portion of said inner cylindricalmember adjacent said perforated lid, said bag having air impervious sidewalls and bottom, the length of said bag along the cylindrical Wall ofsaid inner cylindrical member being less than the length of said innercylinder Wall, so that the bottom of said bag is above the bottom edgeportion of said inner cylindrical member and the cross-sectional area ofthe bag, substantially throughout its length, being substantially equalto the crosssection of the inner cylindrical member.

2, A dust gun as dened in claim 1, wherein said check Valve in thebottom end portion of said outer cylindrical member comprises a bottomplate which is tightly pressed against the Wall of said outercylindrical member in substantially air-tight engagement therewith whensaid bottom plate is subjected to air pressure from within said outercylindrical member, but which is released to permit air to enter withinsaid outer cylindrical member when the pressure of air within said outercylindrical member against said bottom plate is released.

ALBERT MORSINK.

REFERENCES CITED The following references; are o1 record in the fue ofthis patent:

UNITED STATES PATENTS Numlber Name Date 465,484 Magoris Dec. 22, 18911,828,191 Knutson et al Oct. 20, 1931 1,994,294 Williams Mar. 12, 19352,984,504 rRose June 22, 1937 2,184,191 Lusk Dec. 19, 1939 2,514,516Root July l1, 1950

